(FIT)-Module 4 Workshop 7: Electrocradiogrpahic and Electrophysiological Correlations, Atrial Fibrillation, Clinical Scenarios and Syndromes-Gerstenfeld Case 4 Answer

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Video Summary

The discussion focuses on diagnosing atrioventricular re-entry using an accessory pathway, a classic electrophysiology principle. A single coronary sinus electrogram is used to identify changes in tachycardia. The key observation is that the VA interval is shorter during narrow QRS complexes than during wide QRS complexes with left bundle branch block. This indicates an accessory pathway involved in the tachycardia circuit, specifically a left-sided concealed accessory pathway, without requiring further information. Understanding this principle is crucial for recognizing these patterns in electrophysiological studies.

Keywords

atrioventricular re-entry

accessory pathway

coronary sinus electrogram

VA interval

left bundle branch block